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US3172349A
Expired / Lapsed
US
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Air curtains
Assignee: Woods of Colchester Ltd
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Filing: 1961-12-22
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Granted: 1965-03-09
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Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 Courtier Graham Arthur Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:10
CPC Classifications
F; F24; F24F; F24F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB481991A
Cited
US2775187A
Cited
US2862369A
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US2855760A
Cited
US2935925A
Cited
US3023688A
Cited
US3010379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |